| EPA'
s Proposed MP & M Rule |
|
U.S.
Environmental Protection Agency (EPA) has set new stringent effluent
limits in its Proposed Metal Products and Machinery published January 3,
2001 (66 FR 423).
The proposed rule replaces a previous proposal issued May 30, 1995
(60 FR 28210).
The new proposed rule establishes effluent limitations guidelines
and pretreatment standards for MP & M facilities - operations that
manufacture, rebuild, or maintain metal product parts or machines; and
covers effluent discharges from existing and new industrial sites.
The MP & M facilities, according to EPA's updated proposal, are
divided into eight subcategories:
i)
Five subcategories that require treatment for metals and organic
pollutants are general metals, metal-finishing job shops, nonchromium
anodizing, printed wiring board, and steel forming and finishing.
ii)
Three subcategories that require treatment for only organic
pollutants are oily wastes, railroad line maintenance, and shipbuilding
dry docks.
*
Proposed Effluent Limitations (mg/L) For Existing and New Source Treatment
|
ANALYTE
|
SUBCATEGORY
|
|
General Metals
|
Metal-Finishing Job Shop
|
|
Existing
|
New
|
Existing
|
New
|
|
D M
|
D
M
|
D
M
|
D M
|
|
Aluminum
|
- -
|
- -
|
-
-
|
-
-
|
|
Amenable Cyanide
|
0.14 0.07
|
0.14 0.07
|
0.14 0.07
|
0.14 0.07
|
|
BOD5
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Cadmium
|
0.14 0.09
|
0.02 0.01
|
0.21 0.09
|
0.02 0.01
|
|
Chromium
|
0.25 0.14
|
0.17 0.07
|
1.3
0.55
|
0.17 0.07
|
|
Copper
|
0.55 0.28
|
0.44 0.16
|
1.3 0.58
|
0.44 0.16
|
|
Cyanide
|
0.21 0.13
|
0.21 0.13
|
0.21 0.13
|
0.21 0.13
|
|
Lead
|
0.04 0.03
|
0.04 0.03
|
0.12 0.09
|
0.04 0.03
|
|
Manganese
|
0.13 0.09
|
0.29
0.18
|
0.25 0.10
|
0.29 0.18
|
|
Molybdenum
|
0.79 0.49
|
0.79
0.49
|
0.79 0.49
|
0.79 0.49
|
|
Nickel
|
0.50 0.31
|
1.9 0.75
|
1.5 0.64
|
1.9 0.75
|
|
O & G (as HEM)
|
15 12
|
15
12
|
52 26
|
15 12
|
|
Silver
|
0.22 0.09
|
0.05 0.03
|
0.15 0.06
|
0.05 0.03
|
|
Tin
|
1.4 0.67
|
0.03 0.03
|
1.8 1.4
|
0.03 0.03
|
|
TOC
|
87
50
|
87 50
|
78 59
|
101
67
|
|
Total Organics
|
9.0 4.3
|
9.0
4.3
|
9.0 4.3
|
9.0 4.3
|
|
Total Sulfide
|
31
13
|
31
13
|
31 13
|
31
13
|
|
TSS
|
34 18
|
28
18
|
60
31
|
28
18
|
|
Zinc
|
0.38 0.22
|
0.08 0.06
|
0.35 0.17
|
0.08 0.06
|
|
ANALYTE
|
SUBCATEGORY
|
|
Printed Wiring Board
|
Non-Chromium Anodizing
|
|
Existing
|
New
|
Existing
|
New
|
|
D
M
|
D M
|
D M
|
D
M
|
|
Aluminum
|
-
-
|
-
-
|
8.2
4.0
|
8.2
4.0
|
|
Amenable Cyanide
|
0.14 0.07
|
0.14 0.07
|
-
-
|
- -
|
|
BOD5
|
-
-
|
-
-
|
- -
|
-
-
|
|
Cadmium
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Chromium
|
0.25
0.14
|
0.17 0.07
|
-
-
|
- -
|
|
Copper
|
0.55
0.28
|
0.01
0.01
|
- -
|
-
-
|
|
Cyanide
|
0.21 0.13
|
0.21
0.13
|
-
-
|
-
-
|
|
Lead
|
0.04 0.03
|
0.04
0.03
|
-
-
|
-
-
|
|
Manganese
|
1.3
0.64
|
0.29
0.18
|
0.13 0.09
|
0.13
0.09
|
|
Molybdenum
|
-
-
|
-
-
|
- -
|
-
-
|
|
Nickel
|
0.30
0.14
|
1.9
0.75
|
0.50 0.31
|
0.50 0.31
|
|
O & G (as
HEM)
|
52 26
|
15
12
|
52 26
|
15 12
|
|
Silver
|
-
-
|
-
-
|
-
-
|
- -
|
|
Tin
|
0.31
0.14
|
0.09 0.07
|
- -
|
-
-
|
|
TOC
|
101
67
|
101
67
|
-
-
|
-
-
|
|
Total Organics
|
9.0
4.3
|
9.0
4.3
|
-
-
|
-
-
|
|
Total Sulfide
|
31
13
|
31
13
|
-
-
|
-
-
|
|
TSS
|
60
31
|
28
18
|
60
31
|
52
22
|
|
Zinc
|
0.38
0.22
|
0.08
0.06
|
0.38 0.22
|
0.38 0.22
|
|
ANALYTE
|
SUBCATEGORY
|
|
Steel Forming and Finishing
|
Ship-Building Dry Docks
|
|
Existing
|
New
|
Existing
|
New
|
|
D M
|
D M
|
D
M
|
D M
|
|
Aluminum
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Amenable Cyanide
|
0.14 0.07
|
0.14 0.07
|
- -
|
-
-
|
|
BOD5
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Cadmium
|
0.14 0.09
|
0.02 0.01
|
-
-
|
- -
|
|
Chromium
|
0.25 0.14
|
0.17 0.07
|
- -
|
-
-
|
|
Copper
|
0.55
0.28
|
0.44 0.16
|
-
-
|
-
-
|
|
Cyanide
|
0.21 0.13
|
0.21 0.13
|
-
-
|
-
-
|
|
Lead
|
0.04
0.03
|
0.04 0.03
|
- -
|
-
-
|
|
Manganese
|
0.13
0.09
|
0.29 0.18
|
-
-
|
-
-
|
|
Molybdenum
|
0.79 0.49
|
0.79 0.49
|
-
-
|
-
-
|
|
Nickel
|
0.50
0.31
|
1.9
0.75
|
-
-
|
-
-
|
|
O & G (as HEM)
|
15
12
|
15
12
|
16 11
|
16 11
|
|
Silver
|
0.22
0.09
|
0.05 0.03
|
-
-
|
- -
|
|
Tin
|
1.4 0.67
|
0.03 0.03
|
- -
|
-
-
|
|
TOC
|
87
50
|
87
50
|
-
-
|
-
-
|
|
Total Organics
|
9.0
4.3
|
9.0
4.3
|
-
-
|
-
-
|
|
Total Sulfide
|
31 13
|
31
13
|
-
-
|
-
-
|
|
TSS
|
34 18
|
28
18
|
81 44
|
81 44
|
|
Zinc
|
0.38
0.22
|
0.08 0.06
|
- -
|
- -
|
|
ANALYTE
|
SUBCATEGORY
|
|
Oily Wastes
|
Railroad Line Maintenance
|
|
Existing
|
New
|
Existing
|
New
|
|
D
M
|
D
M
|
D
M
|
D
M
|
|
Aluminum
|
-
-
|
- -
|
-
-
|
-
-
|
|
Amenable Cyanide
|
- -
|
-
-
|
-
-
|
-
-
|
|
BOD5
|
-
-
|
-
-
|
34
12
|
34 12
|
|
Cadmium
|
-
-
|
- -
|
-
-
|
- -
|
|
Chromium
|
- -
|
-
-
|
- -
|
-
-
|
|
Copper
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Cyanide
|
-
-
|
- -
|
-
-
|
- -
|
|
Lead
|
- -
|
-
-
|
- -
|
-
-
|
|
Manganese
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Molybdenum
|
-
-
|
-
-
|
-
-
|
-
-
|
|
Nickel
|
-
-
|
-
-
|
-
-
|
-
-
|
|
O & G (as HEM)
|
27
20
|
27
20
|
11 7.6
|
11
7.6
|
|
Silver
|
-
-
|
-
-
|
-
-
|
- -
|
|
Tin
|
-
-
|
-
-
|
- -
|
-
-
|
|
TOC
|
633
378
|
633 378
|
-
-
|
-
-
|
|
Total Organics
|
9.0
4.3
|
9.0
4.3
|
-
-
|
-
-
|
|
Total Sulfide
|
31
13
|
31
13
|
-
-
|
-
-
|
|
TSS
|
63
31
|
63
31
|
30 16
|
30 16
|
|
Zinc
|
-
-
|
-
-
|
-
-
|
-
-
|
*
U.S. Environmental Protection Agency
D
- Daily Limit
TOC - Total Organic Carbon
M
- Monthly Limit
TSS - Total Suspended Solids
BOD5
- 5 Day Biochemical Oxygen Demand HEM - Hexane Extractable Material
EPA
has determined that the best available technology ( BAT) for existing
facilities of the first five metals containing effluent subcategories (see
I ) involves segregation of waste streams, oil/water separation via
emulsion breakers, chemical precipitation and sedimentation, and
in-process pollution prevention. For new facilities discharging
metal-bearing effluent, BAT involves oil/water separation via
ultrafiltration and microfiltration in place of sedimentation which is
rather complex and tedious.
As
for existing and new facilities in ship-building dry docks and railroad
line maintenance facilities, BAT consists of oil/water separation via
dissolved-air floatation (DAF). For the oily wastes subcategory, BAT
consists of oil/water separation via emulsion breakers.
Sectors
Covered by the Proposed MP & M Rule
-
Aerospace
-
Aircraft
-
Bus
and truck
-
Electronic
equipment
-
Hardware
-
Household
equipment
-
Job
shops
-
Miscellaneous
metal products
-
Mobile
industrial equipment
-
Motor
vehicles
-
Office
Machines
-
Ordnance
-
Precious
metals & jewelry
-
Printed
wiring boards
-
Railroad
-
Ships
& boats
-
Stationary
industrial equipment
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 |
